CVE-2018-18384: Info-ZIP UnZip 6.0 has a buffer overflow in list.c, when a ZIP archive has a crafted relationship between the

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MEDIUM 5.5DOWNGRADE

CVE-2018-18384 is a medium-severity flaw (CVSS 5.5) affecting unzip. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Info-ZIP UnZip 6.0 has a buffer overflow in list.c, when a ZIP archive has a crafted relationship between the compressed-size value and the uncompressed-size value, because a buffer size is 10 and is supposed to be 12.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	2.6% (top 15%)
CISA exploited list	No
Weakness	CWE-119
Published	2018-10-16
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: unzip project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-10-16 16:50 UTCPublished CVE record published
2026-06-17 01:47 UTCUpdated Record last modified

unzip project unzip DOWNGRADE

Affected: 6.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.0

1. Check installed version

apt-cache policy unzip || rpm -q unzip || unzip --version

2. No fixed release: DOWNGRADE to a release before 6.0 (Debian / Ubuntu)

apt-cache madison unzip sudo apt install unzip=<VERSION_BEFORE_6.0> sudo apt-mark hold unzip

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list unzip sudo dnf downgrade unzip-<VERSION_BEFORE_6.0> sudo dnf versionlock add unzip

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2018-18384?

unzip: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-18384 being exploited?

CVE-2018-18384 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2018-18384 affect?

CVE-2018-18384 affects unzip. Severity is medium (CVSS 5.5). Info-ZIP UnZip 6.0 has a buffer overflow in list.c, when a ZIP archive has a crafted relationship between the compressed-size value and the uncompressed-size value, because a buffer size is 10 and is supposed to be 12.

How urgent is CVE-2018-18384?

Priority 46/100. Public exploit reference

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References

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